New York possesses a treasure trove of building stones -in lobbies, on facades, sidewalks and curbstone. Water plays an important role in the formation of many of them. The beautiful building materials used in its streets, building facades and lobbies show the richness and variety of colors of these pages of earth history.  On our trip we will see many rock type varieties from North America, Europe, Asia, South America and Africa ranging in age from 3 billion years to a mere 1 million years old. And we will decipher the history that each rock tells.